Upgrade deps and remove unused wintersmith

Author: LostCrew

package.json

@@ -58,8 +58,7 @@
     "less": "^2.7.2",
     "less-plugin-clean-css": "^1.5.0",
     "npm-run-all": "^4.1.5",
-    "regenerator-runtime": "^0.11.1",
-    "wintersmith": "^2.3.6"
+    "regenerator-runtime": "^0.11.1"
   },
   "scripts": {
     "js:lint": "eslint src/js/",